JP3089175B2 - Steel material clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to sheet bars, slabs,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel material joining clamp device for joining steel pieces to each other in a continuous rolling facility for continuously rolling several tens of steel pieces such as billets or blooms.

[0002]

2. Description of the Related Art Conventionally, in a steel sheet hot rolling line, a steel sheet to be rolled has conventionally been heated, rough-rolled and finish-rolled one by one so as to be rolled to a desired thickness. If the steel sheet is rolled one by one, it is inevitable that the line is stopped due to poor biting of the rolled material, and the yield is significantly reduced due to the defective shape of the leading and trailing ends of the rolled material, resulting in a decrease in work efficiency. It was not good. Therefore, recently, a continuous rolling line in which the ends of a steel sheet are joined together and continuously supplied to a hot rolling line to perform rolling has been adopted. FIG. 5 schematically shows a flow of a rolling process in a conventional continuous rolling facility.

[0003] In a continuous hot rolling facility, rolling materials are joined by a steel sheet joining device to perform a rolling process in order to perform the rolling process continuously and efficiently. That is, as shown in FIG. 5, the rear end of the preceding rolled material 11 is located on the downstream side in the transport direction of the rolled materials 11 and 21 in the rough rolling mill group 31 for rolling the rolled materials 11 and 21 into a predetermined shape, or A crop shear 32 and a preforming shear 33 for cutting the leading end of the succeeding rolled material 21 are provided. The crop shear 32 is for cutting the ends of the rolled materials 11 and 21 in a straight line, and the preforming shear 33 is formed in a trapezoidal shape or an arc shape.

A bonding machine 34 is provided downstream of the crop shear 32 and the preforming shear 33. In the joining machine 34, the leading side rolled material 1 is
1 A pair of clamp cylinders 3 for vertically holding the rear end.
On the other hand, a pair of clamp cylinders 39 and 40 for vertically holding the leading end of the succeeding rolled material 21 are mounted on the entrance frame 38, and the entrance frame 38 is attached to the exit frame. The hydraulic cylinder 41 which presses to the 35 side is connected. And, this outgoing side frame 35
And a pair of upper and lower induction heating devices 42 and 4 for joining the ends of the rolled materials 11 and 21 by induction heating between the first and second entry frames 38.
3 are provided. A finishing mill group 44 is provided downstream of the joining machine 34.

[0005] The rolled materials 11 and 21 that have passed through the rough rolling mill group 31 are joined by a joining machine 34 at the rear end and the front end. That is, the rear end of the preceding rolled material 11 is clamped by the clamp cylinders 36 and 37 of the output side frame 35, and the leading end of the succeeding rolled material 21 is clamped by the clamp cylinders 39 and 40 of the entrance side frame 38. You. Then, both rolled materials 11,
The contact portion 21 is pressurized.
When an induced current is applied to the rolling members 2 and 43, an eddy current circulates around the contact portion to be in a semi-molten state, and the rolled materials 11 and 21 are integrally joined. Thereafter, the rolled materials 11 and 21 are subjected to finish forming by the finishing mill group 44.

[0006]

In the above-described joining machine 34 of the conventional continuous hot rolling equipment, the rolled materials 11 and
1 is clamped by each of the clamp cylinders 36, 37 and 39, 40, and the eddy currents generated by the induction heating devices 42, 43 cause the contact portions 12, 22 to move through the contact portions 12, 22 in a state where the ends thereof are pressed by the hydraulic cylinder 41. The rolled material is heated and its peripheral portion is heated by Joule heat to be in a semi-molten state, and the rolled materials 11 and 21 are integrally joined.

In this case, the rolled materials 11 and
21 is heated to a predetermined temperature.
By the contact of each of the clamp cylinders 36, 37, 39, and 40, the contact portions of the rolled materials 11, 21 with the clamp cylinders 36, 37, 39, and 40 are cooled, and a temperature difference is generated with other portions. This temperature difference causes a change in deformation resistance during the subsequent finish forming, and in a rolling mill controlled by rolling force, causes a change in sheet thickness and a change in tension. There was a risk of becoming.

[0008] In order to solve such a problem, a device in which a heating means is incorporated in a rolled material clamping device has been conventionally proposed, for example, disclosed in Japanese Patent Application Laid-Open No. 61-74707. However, the clamp device disclosed in this publication raises the temperature of the steel contact member to 700 ° C. to 1000 ° C.
, Which requires a large-capacity heater, and also requires the provision of a heat insulating member between the main unit and the equipment. There is a problem of doing it.

The present invention has been made to solve such a problem, and provides a steel material joining and clamping apparatus which enables good joining without causing a temperature difference in steel materials when joining and clamping steel materials. The purpose is to:

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a steel material joining and clamping apparatus, wherein an induction heating is performed at a longitudinal rear end of a preceding steel material and a longitudinal front end of a succeeding steel material. In a steel-material joining clamp device for clamping the preceding steel material and the following steel material by a pair of clamp members from the sheet thickness direction when joining them, an uneven portion is substantially perpendicular to the clamp surfaces of the pair of clamp members.
It is characterized in that a plurality are formed along one direction .

[0011] Further, the present invention relates to a steel material joining and clamping apparatus, wherein a heat insulating material is attached to an uneven portion formed on a clamp surface of a pair of clamp members.

Further, the steel material clamping apparatus according to the present invention is characterized in that a preheating means for preheating the clamping surfaces of the pair of clamping members is provided.

[0013]

[Effect] An uneven portion is almost on the clamp surfaces of the pair of clamp members.
By being formed along two directions that are almost perpendicular to each other ,
The preceding steel material or the succeeding steel material clamped by these clamp members does not have a temperature difference due to a local temperature drop, and the leading steel material or the following steel material has a uniform surface temperature even after the clamp is released. Thus, for example,
When preheating the clamp member, the preheating temperature can be set low, and the preheating means can be saved.

In addition, since the heat insulating material is attached to the uneven portions formed on the clamp surfaces of the pair of clamp members, the local temperature decrease of the preceding steel material or the succeeding steel material clamped by the clamp members can be effectively prevented. Can be suppressed.

In addition, since the preheating means for preheating the clamp surfaces of the pair of clamp members is provided, when a local temperature decrease occurs in the preceding steel material or the succeeding steel material clamped by the clamp members, the preheating is performed. By means, it is possible to eliminate the temperature difference due to the temperature drop and to obtain a uniform surface temperature.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a cross section of a steel material joining and clamping apparatus according to one embodiment of the present invention, FIG. 2 is a plan view of a clamp member, FIG. 3 is a cross section taken along line III-III of FIG. 2, and FIG. 5 is a graph showing the surface temperature of a rolled material at the end of clamping with respect to FIG. Members having the same functions as those described in the related art are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 1, the steel material clamping apparatus according to the present embodiment comprises a longitudinally rear end portion of a rolled material 11 as a preceding steel material and a longitudinally distal end portion of a rolled material 21 as a succeeding steel material. It is applied as a part of a joining machine that joins by induction heating in a state where end faces facing each other are abutted. That is, the clamp supporting plates 51 and 52 are disposed above and below the rear end of the rolled material 11, and the clamp plates 53 and 52 are provided on the opposing plane portions of the upper and lower outgoing side clamp supporting plates 51 and 52 . 54 are attached. On the other hand, entrance-side clamp support plates 55 and 56 are disposed above and below the rolled material 21 from the leading end to the joint with the rolled material 11. Clamp plates 57 and 58 are attached to the opposing flat portions, and guide plates 59 and 60 are attached to the opposing flat portions at the joint between the rolled materials 11 and 21. In addition, a pair of upper and lower induction heating devices 42 and 43 are provided above and below a joint between the rolled materials 11 and 21 for inductively heating and joining the ends of the rolled materials 11 and 21, respectively.
High-frequency coils 61 and 62 are mounted on the opposing flat portions.

In this embodiment, as shown in FIGS. 2 and 3, a plurality of convex portions 64 are formed on each of the opposing clamp surfaces of each of the clamp plates 52, 53, 57, 58 to form an uneven shape. A heat insulating material 66 is embedded in the groove-shaped concave portion 65 of the clamp surface. Each of the projections 64 has a square shape in a plan view, and has an interval S between adjacent ones with respect to the width W.
Has almost doubled. Further, the height H is almost less than 1/4 of the width W. It is also possible to incorporate a heater 63 as a preheating means in each of the clamp plates 52, 53, 57, 58 described above, and the heaters 63 can preheat each of the clamp plates 52, 53, 57, 58. . That is, the rolled materials 11 and 21 have passed through a group of rough rolling mills for rolling into a predetermined shape, and have been heated to a predetermined temperature. Accordingly, the preheating temperature of each of the clamp plates 52, 53, 57, 58 preheated by the heater 63 is maintained by the heat insulating material 66, and the respective clamp plates 52, 5
The temperatures of 3, 57 and 58 can be kept constant, and the preheating temperature of the heater 63 can be set low to save power.

The rolled materials 11 and 21 that have passed through the rough rolling mills (not shown) are clamped by the steel-material joining clamp device of the present embodiment, and the rear end and the front end are joined by the joining machine. Joined. That is, the rear end of the preceding rolled material 11 is connected to the clamp plates 5 of the output side clamp support plates 51 and 52.
3, 54. On the other hand, the following rolled material 2
The front end portion 1 is held by the clamp plates 57 and 58 while being guided by the guide plates 59 and 60 of the entrance frame clamp support plates 55 and 56. Then, opposing end surfaces of the two rolled materials 11 and 21 are pressed by a hydraulic cylinder (not shown), and in this state, the induction heating devices 42 and 4 are pressed.
When an induced current is applied to each of the high-frequency coils 61 and 62 of No. 3, the eddy current circulates around the contact portion to be in a semi-molten state, and the rolled materials 11 and 21 are integrally joined.

At the time of clamping the rolled materials 11 and 21, the clamp plates 52, 53, 57 and 58 are kept in heat by the convex portions 64 and the concave portions 65 and the heat insulating material 66, so that the rolled materials 1 and 21 are kept.
The temperature of the rolled materials 11 and 21 clamped by the clamp plates 52, 53, 57 and 58 has a small local temperature drop at the clamp portion, and is substantially the same even after the clamp is released. A uniform surface temperature can be obtained. Therefore, there is no change in the deformation resistance at the time of finish forming due to the surface temperature difference between the rolled materials 11 and 21, and in the rolling mill of the rolling force control, there is no fluctuation in the sheet thickness and tension, and the yield of the product thickness is poor, No breakage due to high tension occurs.

Also, a convex portion 64 is formed on the clamp surface of each of the clamp plates 52, 53, 57, 58 for clamping the rolled materials 11, 21.
Are formed and a heat insulating material 66 is buried therein, and each of the clamp plates 52, 53, 5 heated by the heater 63.
The preheating temperature of the heaters 7 and 58 is kept constant by the heat insulating material 66, and the preheating temperature of the heater 63 can be set low to reduce the capacity and save power. , 53, 57, 58 need not be heated to a high level, which is advantageous in terms of strength and life.

Here, the operation and effect of the steel material joining and clamping apparatus of this embodiment will be described with reference to the graph shown in FIG. The graph shown in FIG. 4 shows the surface temperatures of the rolled materials 11 and 21 at the end of the clamping with respect to the preheating temperatures of the clamp plates 53, 54, 57 and 58 by the heater 63. Then, the rolled material was formed of low carbon steel, its initial temperature was set to 1150 ° C., clamped with a clamp plate for 17 seconds, and the surface temperature of the rolled material after 30 seconds was measured with a radiation thermometer. On the other hand, the clamp plate is made of stainless steel (SU
In step S304), a glass fiber system was used as a heat insulating material. Then, three types of clamp plates, A: a plane clamp, B: a clamp with only a convex portion, and C: a clamp with a convex portion and a heat insulating material, were measured.

According to the graph shown in FIG. 4, in the surface portion of the rolled material which is not clamped by the clamp plate, the temperature decreases from the initial temperature of 1150 ° C. to 1050 ° C.
For example, when the preheating temperature of each clamp plate is 900 ° C., the temperature of the surface of the rolled material clamped by the flat clamp A of the rolled material drops to 1040 ° C. Similarly, the temperature of the surface of the rolled material clamped by the convex portion clamp B of the rolled material has dropped to 1060 ° C.
The temperature of the surface of the rolled material clamped by the projection C of the rolled material and the clamp C formed of the heat insulating material is lowered to 1070 ° C. As described above, the temperature of the convex clamp B is lower than that of the planar clamp A, and the temperature of the convex clamp B is smaller than that of the clamp C using the heat insulating material.

In the above-described embodiment, the built-in heater 63 is used as a preheating means for each of the clamp plates 52, 53, 57, 58. However, the present invention is not limited to this heater 63. In the present invention, the heater 63 is not an essential component, and the temperature difference can be reduced to 50 ° C. or less without providing the heater 63. Further, the shapes of the convex portions 64 and the concave portions 66 of the clamp plates 52, 53, 57, 58 and the buried shape of the heat insulating material 66 are not limited to the embodiments.

[0026]

As described above in detail with reference to the embodiments, according to the steel material clamping apparatus of the present invention, the longitudinal rear end of the preceding steel material and the longitudinal front end of the succeeding steel material are separated. In a steel material joining clamp device for holding the preceding steel material and the following steel material by a pair of clamp members from the sheet thickness direction when joining by induction heating, a concave and convex portion is substantially perpendicular to the clamp surfaces of the pair of clamp members .
Since the plurality of steel members are formed along the two directions, the leading steel material or the following steel material clamped by the clamp member has a small temperature difference due to a local temperature drop, and the leading steel material or the following steel material is uniformly removed even after the clamp is released. The surface temperature can be set, and the preceding steel material and the following steel material can be satisfactorily joined.

Further, according to the steel material joining and clamping apparatus of this embodiment, since the heat insulating material is attached to the concave and convex portions formed on the clamp surfaces of the pair of clamp members, the preceding steel material clamped by the clamp member or the succeeding steel material is clamped. The local temperature decrease of the steel material can be effectively suppressed.

Further, according to the steel material joining and clamping apparatus of this embodiment, since the preheating means for preheating the clamping surfaces of the pair of clamping members is provided, the preheating means is locally applied to the preceding steel material or the following steel material clamped by the clamping members. When a significant temperature drop occurs, preheating by the preheating means keeps the temperature of the clamp member constant, thereby eliminating a temperature difference due to the temperature drop and providing a uniform surface temperature. The preheating temperature of the clamp member by the means can also be set low, and the labor of the preheating means can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a steel material joining clamp device according to an embodiment of the present invention.

FIG. 2 is a plan view of a clamp member.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a graph showing the surface temperature of a rolled material at the end of clamping with respect to the preheating temperature of the clamp plate.

FIG. 5 is a schematic diagram showing a flow of a rolling process in a conventional continuous hot rolling facility.

[Explanation of symbols]

 11 Rolled material (preceding steel material) 21 Rolled material (following steel material) 51,52 Outgoing clamp support plate 53,54 Clamp plate 55,56 Incoming clamp support plate 57,58 Clamp plate 59,60 Guide plate 63 Heater (preheating) Means) 64 convex portion 65 concave portion 66 heat insulating material

Continued on the front page (72) Inventor Kunio Miyamoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Inside Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Akio Kuroda 4-622 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture No. Mitsubishi Heavy Industries, Ltd.Hiroshima Works (72) Inventor Masaji Yoshikawa 4-2-2 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Hiroshima Research Institute (72) Inventor Hideyuki Nikaido Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture 1 Kawasaki Steel Corporation Chiba Works (72) Inventor Shigeru Isoyama 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture Kawasaki Steel Corporation Chiba Works, Chiba-shi (72) Inventor Takeshi Hirabayashi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Toshiaki Amagasa 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works (72) Inventor Katsuhiro Takebayashi 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Kawasaki Steel Stock Association Inside the Iron and Steel Research Laboratory (56) References JP-A-7-88505 (JP, A) JP-A-63-49307 (JP, A) JP-A-7-299502 (JP, A) JP-A-7-16611 (JP, A A) JP-A-3-114686 (JP, A) JP-A-5-76910 (JP, A) JP-A-8-1204 (JP, A) JP-A-6-70981 (JP, U) (58) Survey Field (Int. Cl. ⁷ , DB name) B21B 15/00 B21B 1/26 B23K 13/01

Claims (3)

(57) [Claims] When a longitudinal rear end portion of a preceding steel material and a longitudinal front end portion of a succeeding steel material are joined by induction heating, the preceding steel material and the following steel material are respectively separated from a sheet thickness direction by a pair of clamp members. A clamping apparatus for joining steel materials, wherein a plurality of concave and convex portions are formed on the clamping surfaces of the pair of clamp members along two directions substantially orthogonal to each other . 2. The steel material joining and clamping device according to claim 1, wherein a heat insulating material is attached to the concave and convex portions formed on the clamping surfaces of the pair of clamping members. 3. The steel material joining clamp device according to claim 1, further comprising a preheating means for preheating the clamping surfaces of the pair of clamp members.